Re: the " 'official' point of view" expressed by kernelnewbies.org regarding reiser4 inclusion

David Masover
2006-08-01T17:42:06Z

Gregory Maxwell wrote:
> On 8/1/06, David Masover <ninja@slaphack.com> wrote:
>> Yikes. Undetected.
>>
>> Wait, what? Disks, at least, would be protected by RAID. Are you
>> telling me RAID won't detect such an error?
>
> Unless the disk ECC catches it raid won't know anything is wrong.
>
> This is why ZFS offers block checksums... it can then try all the
> permutations of raid regens to find a solution which gives the right
> checksum.

Isn't there a way to do this at the block layer? Something in
device-mapper?

> Every level of the system must be paranoid and take measure to avoid
> corruption if the system is to avoid it... it's a tough problem. It
> seems that the ZFS folks have addressed this challenge by building as
> much of what is classically separate layers into one part.

Sounds like bad design to me, and I can point to the antipattern, but
what do I know?